Definition of pachycephaline in English:

pachycephaline

Pronunciation /ˌpakɪˈsɛfəlʌɪn/ /ˌpakɪˈkɛfəlʌɪn/

adjective

Ornithology
  • Of or relating to a group of passerine birds including the thickheads or whistlers of Australasia.

    These birds were formerly regarded as a subfamily Pachycephalinae in the family Laniidae, or later in the family Muscicapidae. They are now usually placed in a separate family Pachycephalidae, into which other related birds may be placed by some authors.

Origin

Late 19th century; earliest use found in The Century Dictionary. From scientific Latin Pachycephalinae, subfamily name from Pachycephala, genus name + -inae.